The death toll in Haiti as a result of Hurricane Matthew – the most powerful Caribbean storm in a decade – has soared to more than 300, officials say.

Some 50 people were reported killed in the town of Roche-a-Bateau alone.

The nearby city of Jeremie saw 80% of its buildings levelled. In Sud province 30,000 homes were destroyed.

The hurricane, now a Category Three storm with sustained winds of 120mph (193km/h), is heading up the coastline of the US state of Florida.

At 07:00 local time (11:00 GMT) Matthew was still off the coast, centred about 25 miles (40km) east of Cape Canaveral and moving north-north-west at about 14mph (22km/h), the National Hurricane Center said. It remains unclear whether it will make landfall.